Dynamo-electric machine.



0. w. STARKER. DYNANIO ELECTRIC MACHINE.

APPLICATION FILED JUNE 6.1911.

Patented 001. 12, 1915.

BY V

' ATTORNEY EEIEED STATES PATENT OFFICE.

CHARLnsVW. 'sTAnKER, or ri'r'rsBURGH, PnNivsYLvANimuAssrGNon' To WESTINGYHousn ELECTRIC ann' MANUFACTURING CCMPANY,A CoRroRA'rroN Aor PENNSYL-vAivIA.l

To all whom t may: concern:

, Beit known that I, CHARLES vW; Sramana,

a subject of the Emperor'of Germany, `and a resident of-Pittsburgh,inthe county of Allegheny and State of Pennsylvania, have invented anewVand useful Improvement in Dynamo-Electric Machines, of which-'thefollowing is afspeciication.I 1 y My invention relatesto dynamo-electricmachines and particularly to the stationary."

members ofinduction motors.

rIhe object ofrmyl invention is toprovidev a stator thatshalllbesimpleand relatively inexpensive in construction andshall-embodya laminatedicore structure, 'the plates of which are clamped togetherindepend# v doveftail'notches or gro'ove's,andlaminated cores, theplates or laminas of which are provided with dove-tail projections tofit into the notches orgrooves in the frame, and

- are individually placed Vin the frame Vand clamped together by endplates which are held in positionby keying them to the frame.

According to my present invention, I provide a stationary membercomprising a hollow cylindrical frame, having a smooth bore, a coremember, the plates of which are clamped together independently of theframe, and a simple means for vcentering the core member in the frame.`I am thus able to utilize one size and style of frame for a large numberof machines of widely different Capacities.

In order to accomplish the desired results and to reduce the cost of themachine as much as possible, -I provide a hollow wrought-steel frame, apressed steel base or supporting member and a particularly simple corestructure, .the laminas of which are bolted together between endplateshaving Vthe same form vand outline as the laminasand preferably terial.Y

Figure k1of the accompanying drawings is an end elevation, partially insection, of an induction motor stator constructed in accordance. with myinvention. Fig. 2 is a sectional view on line II-II of Fig. l.

VReferring to the drawing, the structure here shown comprises a hollowcylindrical nmade of magnetizable ma- DYNAMo-ELECTRIC MACHINE'I,

spiatibn of Letters raient. Patented oct. 12', 1915.

Appncationnieaaunee,1911. 1 semaine. 631,615'. 1

framel which isy preferably formed by bending rectangular-steel plate ofproperY di- 'mensiona a-ycorememberf 2 whichr is supported in theframe1, and a base or supportingl member 3, which is preferably formed ofpressed steel and is secured to the frame l by -rivets 4'. 1

The core member 2 comprises a pluralityy .of plates whicharesubstantially square in outline and from which a central diskhas beenremoved. Thewcorners of the square are rounded to lit into the frame 1and their inner edges are provided'with notches 5 to receive the coils(not shown), Vin the usual manner. y Y z, Y

The plates of which the core member composed are assembled within theframe'l in two principal outer groups 6; and 7.and anlintermediate group8'composed of relatively few plates, asv shown in Fig. 2l of thedrawings. The plates of which the groups 6 Vand 7 "aree composed-fareVcorrespondingly r""located but the plates of the group 8 are skewed,relative to the plates of the other groups, through an angle of 450. Bythis means, four grooves 9 are located symmetrically relative to theframe 1 into which centering pins 10`project. The centering pins may beof any suitable form, being preferably of steel and tted into the frame1,

as shown in the drawings.` The laminas are clamped together between theend plates 11 by means of rivets Vor bolts 12 andare prevented fromshifting circumferentially in thevframebymeans of a key 13.

When the end rings, which clamp the laminas together, are held inposition by means of segmental keys located in circumferential groovesin the frame, yin a well known manner, leither various sizes and stylesof rings must vbe employed in order to 4adapt different sizes of coremembers to the same frame, or the location of the circumferential keygrooves must be changed for. each dierent size of core member. On theother hand, the end rings 'and the frameof my invention may be utilizedwithout change for core members of widely different sizes.

Y It will be evident to those skilled in the 1 art that the stator of myinvention may be manufactured in large quantities with very much lessexpense than corresponding structures known in the prior art.

. I claim as my invention:

1. A dynamo-electric machine comprising a smooth-bore frame havinginwardly projecting pins and a supporting base, a laminated core memberprovided with means independent of the frame for clamping its laminaetogether and with recesses to receive the inwardly projecting pins.

2. A dynamo-electric machine comprising a hollow cylindrical framehaving inwardly' projecting side pins and a laminated core member havingmeans independent of the frame for clamping the lamina@ together andrecesses to receive said pins.`

.3. A dynamo-electric machine comprising a hollow cylindrical framehaving a plurality of inwardly projecting pins and a laminated corestructure having means independent of the frame for clampingy the lamintogether and grooves in its outer surface to receive said inwardlyprojecting pins.

LL. A dynamo-electric machine comprising a hollow cylindrical framehaving a pluf rality of inwardly projecting pins, a core structurecomprising a plurality of similar plates disposed in skewed or staggeredgroups to provide grooves in its outer surface for the reception of saidinwardly projecting pins.

5. A dynamo-electric machine comprising a substantially cylindricalframe having internal projections, and a core member comprisingsubstantially rectangular laminae some of which are circumferentiallydisplaced to form lateral grooves to receive said internal projections.

G. In a dynamo-electric machine, the combination with a substantiallycylindrical frame having a plurality of spaced internal projections, ofaY core member comprising lamina@ ot substantially rectangular exterunal contour, some of which are circu1nferentially displaced to formrecesses to receive said internal projections, said core member engagingthe inner face of the cylindrical frame.

7. In a dynamo-electric machine, the combination with a substantiallycylindrical frame having four uniformly spaced internal projections, ofa core member comprising substantially rectangular laminae some of whichare circumferentially displaced to form recesses with which saidinternal projections engage.4

In testimony whereof, I have hereunto subscribed mv name this 23rd dayof May,

CHARLES WV. STARKER. Witnesses R. P. ScHoYEn, B. B. MINES.

Gopicl of this` patent may be obtained for five cents each, byaddressing the Commissioner of Patents. Washington, D. C.

